My wife seems to print her 6 x 6 negs square prefectly well with a normal two blade 8 x 10 or 16 x 20 easel. She trims off the excess paper with a rotary cutter before exposure and uses it as the test strip. I don't really see the problem.
Me too use ordinary 2 blade (Meopta) easel. I do one of two things. Either cut paper to make it square after printing and drying or I leave rest of paper under bottom of image, but during printing I cover part of paper showing up on other side of blade to prevent any stray light maybe fall on rest of paper.
But, I will buy 4 blade (LPL) easel.
I simply have one paper with lines painted on it for all paper sizes I use, and line blades with those lines, so no worries about correct placing of blades...
Bosnia... You don't have to be crazy to live here, but it helps...
No things in life should be left unfinis